The results of decoding the flight data recorder from the Kogalymavia Airbus A321 passenger plane, which crashed in the Sinai peninsula on October 31, killing all 224 people on board, have not helped establish the cause of the air accident, the Kommersant newspaper reported on Friday.

According to the newspaper's sources, the decoding results did little to help the investigation into this air crash.

"The recorder has shown that for the entire duration of the flight, which continued for a little longer than 20 minutes, all systems of the A321 were operating properly. After takeoff, the airplane, which was on autopilot, almost gained the altitude needed to enter its assigned flight level. However, afterwards, something happened, after which the recording of absolutely all parameters of the airplane systems' work abruptly stopped," the newspaper said.

One of the sources, speaking to Kommersant, compared this recording to a cardiogram that registered only a person's sudden death caused by a cardiac failure, whereas only additional tests may help establish the actual reasons of what happened in such a situation.

The newspaper's experts believe that such a situation could have been triggered by the explosive decompression of the airplane's cabin, causing the plane's fuselage to separate from its tail, which accommodated the emergency flight data recorder.

This separation was accompanied by a rupture of all cables that linked the black box with the information sensors, the newspaper said.

However, the operational recorder, which collects information on a daily basis in order to monitor the functioning of all airplane systems and the crew's actions, may have continued to record the parameters of the already uncontrollable flight. But this operational recorder was located in the cockpit, was not protected by any specialized armored and fireproof cover and apparently crashed on impact with the ground, Kommersant said.